Cross-rolling apparatus.



PATENTED SEPT. 4, 1906 J. J DUNN. GROSS ROLLING APPARATUS.

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m mm a N w W Q Tm m v MW 7 A WWW STATES PATENT oFFIoE.

.] l lltltli' JAY .l)U-NN, OF GREENVI'LLE, PENNSYLVANIA, ASSIGNOR'TO SHELBY S'lEliL TUBE GOTilPANY, OF PITSBURG, PENNSYLVANIA, A'UORPORA- TlON OF NEW JERSEY.

Specification of Letters Patent.

Patented Sept. 4, 1906.

Application filed April 19. 1905. Serial No. 256.374.

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Be it known that l, JERRY JAY DUNN, of Greenville, Mercer county, Pennsylvania, ha ve invented a new and useful Cross-Rolling Apparatus, of which the following is a full, clear, and exact description, reference being hzid to the accompanying drawings, forming part of this specification, in which Figure 1 is a small diagrammatic plan View of my improved apparatus. Fig. 2 is a partial top plan view, on a larger scale, showing the parts in position at the beginning of the cross-rolling operation. Figs. 3, 4, and 5' are partial horizontal sections showing in Fig. 3 the parts in position before beginning the operation, in Fig. at the beginning of the operntion, and in l ig. 5 at the end oi the operation; and Fig. ii is a vertical cross-section of Fig. 4.

My invention relates to the reeling or '.i'ossi'olliiig ol tubes.

in the cross-rolling oi seamless tubes al'te-r rolling the hollow blank on a plug-mill dillicult has been experienced in handling the plug or mandrel which was held on thoinandrel stem or support between the rolls. Where this ball or mandrel was secured to the lllillltll'tl-l'Utl, it was necessary either to pull the ball or plug through the tube after the same had been passed through the machine or else withdraw the bar or stem with itsplug detached llOlll the tube in the opposite direction. l lither operation reduces the output and capacity ol the machine, interl'ering with the supports l'or the bar or mandrel-rod and requiring extra labor in operatton.

My intention overcomes these ditliculties, and it consists in providing in across-rolling mill a mandrel stem or support and a detachable ball, plug, or mandrel which may be dropped l'roni the end ol the. mandrel-rod alter the tube has passed the reeling-mill.

it also consists in so shaping the ball or mandrel and the end ol' the mandrel-rod that the. mandrel or ball will properly seat itself on the imuulrel-rod by the action of the entering tube.

It further consists in the construction and :u'rangeuicnt ol the parts, as hereinafter more 'lfully described and claimed.

vln the drawings, .2 and 3 represent the positively-driven shew rolls, which are inclined in opposite directions, as in the ordinary cross-rolling mill.

4 indicates the mandrel-rod, and 5 the detachable mandrel or plu I preferably form this plug with a conica recess in its rear end and make the plug in the general form of a projectile. The rod is preferably provided with an enlarged end portion 6, having a conical point or guide portion 7 projectin at its center. A shoulder is thus forme around the base of the point, against which the base of the mandrel-head ma seat. The enlarged portion 6 of the mandre -rod is preferably cylindrical and is larger than the rod proper, but preferably slightly smallerthan the plug or ball 5. The sizeof the part 6 is so proportioned that when the plug and the part 6 lic in separated position upon the lower guide 8 the conical point on the mandrel-rod will be in proper position to enter the conical recess as the tube enters and forces the ball into seating position on the rod.

in the operation ofthe device the tube enters the cross-rolling mill over any suitable feed-tablcsuch as shown at 9 in Fig. 1 and as its forward end cn ages the ball or mandrel 5 itiorces it back horn the position shown in Fig. 3 into the seating position on the mandrel-rod, as shown in Fig. 2. In ad (lit-ion to the lowerguide-support 8 I preferably employ an upper correspondin guide 10, these guides being separated sufiieiently to allow the tube to pass, but holding the mandrel and mandrel-rod loosely in place.

In Fig. 4 the parts are'shown in position during the cross-rolling operation. At the end of the operation as the rear end of the seamless tube passes the mandrel the mandrel or ball jumps away from the end of the nnnulrel-rod, assuming a position same as shown in Figs. 3 or 5. 'As the part 6 of the in andrel-rod, is smaller than the inner diameter oi the reeled tube, the mandrelod can be easily withdrawn-by any sui able apparatus, such as shown at 11 in Fig. '1, leaving the plug in its position between the rolls. ing the reeling operation the inside of the tube is smoothed and fuiished and grooves or scorings are removed. The side face of the hall or plug is so shaped that it holds the ball 1n proper position on the guide to be pushed in 5 into seating position as-the tube enters.

Dur-

The advantages of my invention result from the use of the mandrel-rod with a removable mandrel or ball between the rolls of across-rolling mill, also from the use of the self-seating ball and the sup ort which holds it in plaee, While the mandre -rod is removed. In the preferred form all manual handling of the mandrel or ball is done away with, as it is kept backby the operation as the rod leaves it and rests .on the guide in position to be pushed into seating position again as the next tubeenters.

Many variations may be made in the form and arrangement of the cross-rolls, the mandrel, t e mandrel-head, the guides, &e., and the mi inay be used for different purposes without departing from my invention.

=1. cross-r0lling mill having a guide be tween the rolls, and-a IHBJIHlIQlIOd having a detachable mandrel or ball arranged to rest on the guide substantially as deseribed.

g 2'. A cross-rolling mill having between the rolls a removable mandrel or ball, and a mandrel-rod normally detached from the ball and movable dndependently thereof, the front endportionof the rod and the rear porof'the mandrelor ball being so shaped as t-causeselfseating of the ball on the rod on the entrance ofthe tube; substantially sis-described.

3. A cross-r0lling mill having a removable mandrel-head, and a mandrel-rod movable independently of the head, said parts having an interfitting recess and pin connection arsenses ranged to cause automatic sealing, em means for holding the head between the 'o i ll when the rod is removed; substantially 41 described.

4. A cross-rolling mill having: upper and lower guides between the rolls in. Cillilllllllltion with a mandrel-rm], and a removable mandrel or ball; substantially as dvsr-ribod,

5. A cross mlling mill having rolls. a men drel-rod with an. enlarged eylindrh-al front end, a removable inandi'eldiezid ol' sligghtl larger diameter than the enlarged portion of the rod, and a guide between the rolls for the mamlrel-r0d; substantially as described.

6. In a cross-rolling mill, a supportingf in testimony \i'hvreoi a. haveherenn'io sot my hand.

lli'tnesses:

WI lt. JOHNSTUK, linsmn ll. Mesa, 

